$(function () {

    /* initialize the external events
     -----------------------------------------------------------------*/
    function ini_events(ele) {
      ele.each(function () {

        // create an Event Object (https://fullcalendar.io/docs/event-object)
        // it doesn't need to have a start or end
        var eventObject = {
          title: $.trim($(this).text()) // use the element's text as the event title
        }

        // store the Event Object in the DOM element so we can get to it later
        $(this).data('eventObject', eventObject)

        // make the event draggable using jQuery UI
        $(this).draggable({
          zIndex: 1070,
          revert: true, // will cause the event to go back to its
          revertDuration: 0  //  original position after the drag
        })

      })
    }

    ini_events($('#external-events div.external-event'))

    /* initialize the calendar
     -----------------------------------------------------------------*/
    //Date for the calendar events (dummy data)
    var date = new Date()
    var d = date.getDate(),
      m = date.getMonth(),
      y = date.getFullYear()

    var Calendar = FullCalendar.Calendar;
    var Draggable = FullCalendar.Draggable;

    var containerEl = document.getElementById('external-events');
    var checkbox = document.getElementById('drop-remove');
    var calendarEl = document.getElementById('calendar');

    // initialize the external events
    // -----------------------------------------------------------------

    new Draggable(containerEl, {
      itemSelector: '.external-event',
      eventData: function (eventEl) {
        return {
          title: eventEl.innerText,
          backgroundColor: window.getComputedStyle(eventEl, null).getPropertyValue('background-color'),
          borderColor: window.getComputedStyle(eventEl, null).getPropertyValue('background-color'),
          textColor: window.getComputedStyle(eventEl, null).getPropertyValue('color'),
        };
      }
    });

    var calendar = new Calendar(calendarEl, {
      headerToolbar: {
        left: 'prev,next today',
        center: 'title',
        right: 'dayGridMonth,timeGridWeek,timeGridDay'
      },
      themeSystem: 'bootstrap',
      //Random default events
      events: [
        {
          title: 'All Day Event',
          start: new Date(y, m, 1),
          backgroundColor: '#f56954', //red
          borderColor: '#f56954', //red
          allDay: true
        },
        {
          title: 'Long Event',
          start: new Date(y, m, d - 5),
          end: new Date(y, m, d - 2),
          backgroundColor: '#f39c12', //yellow
          borderColor: '#f39c12' //yellow
        },
        {
          title: 'Meeting',
          start: new Date(y, m, d, 10, 30),
          allDay: false,
          backgroundColor: '#0073b7', //Blue
          borderColor: '#0073b7' //Blue
        },
        {
          title: 'Lunch',
          start: new Date(y, m, d, 12, 0),
          end: new Date(y, m, d, 14, 0),
          allDay: false,
          backgroundColor: '#00c0ef', //Info (aqua)
          borderColor: '#00c0ef' //Info (aqua)
        },
        {
          title: 'Birthday Party',
          start: new Date(y, m, d + 1, 19, 0),
          end: new Date(y, m, d + 1, 22, 30),
          allDay: false,
          backgroundColor: '#00a65a', //Success (green)
          borderColor: '#00a65a' //Success (green)
        },
        {
          title: 'Click for Google',
          start: new Date(y, m, 28),
          end: new Date(y, m, 29),
          url: 'https://www.google.com/',
          backgroundColor: '#3c8dbc', //Primary (light-blue)
          borderColor: '#3c8dbc' //Primary (light-blue)
        }
      ],
      editable: true,
      droppable: true, // this allows things to be dropped onto the calendar !!!
      drop: function (info) {
        // is the "remove after drop" checkbox checked?
        if (checkbox.checked) {
          // if so, remove the element from the "Draggable Events" list
          info.draggedEl.parentNode.removeChild(info.draggedEl);
        }
      }
    });

    calendar.render();
    // $('#calendar').fullCalendar()

    /* ADDING EVENTS */
    var currColor = '#3c8dbc' //Red by default
    // Color chooser button
    $('#color-chooser > li > a').click(function (e) {
      e.preventDefault()
      // Save color
      currColor = $(this).css('color')
      // Add color effect to button
      $('#add-new-event').css({
        'background-color': currColor,
        'border-color': currColor
      })
    })
    $('#add-new-event').click(function (e) {
      e.preventDefault()
      // Get value and make sure it is not null
      var val = $('#new-event').val()
      if (val.length == 0) {
        return
      }

      // Create events
      var event = $('<div />')
      event.css({
        'background-color': currColor,
        'border-color': currColor,
        'color': '#fff'
      }).addClass('external-event')
      event.text(val)
      $('#external-events').prepend(event)

      // Add draggable funtionality
      ini_events(event)

      // Remove event from text input
      $('#new-event').val('')
    })
  })